Does anyone know how to get that vehicle that is inbetween Gotham Park(Bonus level inparticular) and Ace Chemicals. There could have been others there but can't remember as I have all but one on the map.

On the map the vehicle shows it to be a kind of truck with radar/antenna on top of it. I have tried setting way points but I can't find it, does anyone know what the vehicle is and where I could find it?